diff --git a/packages/ilmomasiina-backend/src/models/migrations/0005-add-indexes.ts b/packages/ilmomasiina-backend/src/models/migrations/0005-add-indexes.ts
new file mode 100644
index 00000000..22938954
--- /dev/null
+++ b/packages/ilmomasiina-backend/src/models/migrations/0005-add-indexes.ts
@@ -0,0 +1,35 @@
+import { defineMigration } from './util';
+
+export default defineMigration({
+  name: '0005-add-indexes',
+  async up({ context: { sequelize } }) {
+    const query = sequelize.getQueryInterface();
+    await query.addIndex(
+      'quota',
+      {
+        name: 'idx_quota_main',
+        fields: ['eventId', 'deletedAt'],
+      },
+    );
+    await query.addIndex(
+      'signup',
+      {
+        name: 'idx_signup_main',
+        fields: ['quotaId', 'deletedAt', 'confirmedAt', 'createdAt'],
+      },
+    );
+    await query.addIndex(
+      'answer',
+      {
+        name: 'idx_answer_main',
+        fields: ['signupId', 'questionId', 'deletedAt'],
+      },
+    );
+  },
+  async down({ context: { sequelize } }) {
+    const query = sequelize.getQueryInterface();
+    await query.removeIndex('quota', 'idx_quota_main');
+    await query.removeIndex('signup', 'idx_signup_main');
+    await query.removeIndex('answer', 'idx_answer_main');
+  },
+});
diff --git a/packages/ilmomasiina-backend/src/models/migrations/index.ts b/packages/ilmomasiina-backend/src/models/migrations/index.ts
index 5260e94a..3fd4b66d 100644
--- a/packages/ilmomasiina-backend/src/models/migrations/index.ts
+++ b/packages/ilmomasiina-backend/src/models/migrations/index.ts
@@ -6,6 +6,7 @@ import _0001_add_audit_logs from './0001-add-audit-logs';
 import _0002_add_event_endDate from './0002-add-event-endDate';
 import _0003_add_signup_language from './0003-add-signup-language';
 import _0004_answers_to_json from './0004-answers-to-json';
+import _0005_add_indexes from './0005-add-indexes';
 
 const migrations: RunnableMigration<Sequelize>[] = [
   _0000_initial,
@@ -13,6 +14,7 @@ const migrations: RunnableMigration<Sequelize>[] = [
   _0002_add_event_endDate,
   _0003_add_signup_language,
   _0004_answers_to_json,
+  _0005_add_indexes,
 ];
 
 export default migrations;